Every year, I order 60 rule books, a bunch of case books and some official's manuals for my rec league through our state HS association. They have an on-line ordering form. After the books arrive, they bill us and our treasurer writes them a check. There is no shipping because I pick them up at their office, which used to be about 5 minutes from my house until they moved. Now, it's about 20 minutes away. It's still worth the drive.
Man - if only everything in life was this easy.